Experimental Studies of MLI Systems at Very Low Boundary Temperatures

Spradley, I. E.; Nast, T. C.; Frank, D.J.

doi:10.1007/978-1-4613-0639-9_57

Cited by 24 publications

(11 citation statements)

References 1 publication

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“…The Lockheed equation as presented in equation (1) below forms the basis of MLI heat load calculations and has been proven to be reliable in heat load predictions. The total MLI heat load is then calculated by…”

Section: Legacy MLI Designmentioning

confidence: 99%

“…MLI configurations in most MRI cryostats use a single, constant layer density, represented by N in equation (1). Using the semi empirical equation (1), this constant density approach has been shown to be repeatable and reliable in production MRI magnets.…”

Section: Legacy MLI Designmentioning

confidence: 99%

“…Using the semi empirical equation (1), this constant density approach has been shown to be repeatable and reliable in production MRI magnets.…”

Section: Legacy MLI Designmentioning

confidence: 99%

“…The amount of literature available on variable density MLI is limited [1,4,6], however there is increasing interest in using it in space vehicle support systems [2,3,7]. Such MLI systems are used in storage of high value cryogens and thus tend to be custom made in small quantities without concern for repeatability and mass production in an industrial environment.…”

Section: Introductionmentioning

confidence: 99%

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Improving MRI magnet thermal performance using variable density multilayer insulation

Zia¹,

Rutherford²,

Einziger³

2012

AIP Conference Proceedings

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Careful techniques for multilayer insulation (MLI) wrapping of MRI magnet cryostats have been shown to be critical in establishing a net Zero Helium Boil Off. Traditional MLI together with a cryocooler have been used in such 'Zero Boil Off' cryostats for many years. This paper discusses how the evolution in design of MRI magnet cryostats is challenging traditional MLI. By looking at the fundamental design equations for MLI, new insight can be gained into improving the design using variable density insulation. A new, proprietary method for creating variable density in MLI was devised and the resulting blankets were applied to MRI magnets. Results show a 10% improvement in insulation performance and a 42% improvement in material cost of the MLI. This new Variable Density MLI also holds promise for application to other liquid helium cryostats.

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Section: Legacy MLI Designmentioning

confidence: 99%

Section: Legacy MLI Designmentioning

confidence: 99%

“…Using the semi empirical equation (1), this constant density approach has been shown to be repeatable and reliable in production MRI magnets.…”

Section: Legacy MLI Designmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Improving MRI magnet thermal performance using variable density multilayer insulation

Zia¹,

Rutherford²,

Einziger³

2012

AIP Conference Proceedings

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show abstract

“…11,15 Modeling the radiative cooler with a constant degradation factor of 1.7 gave consistent node temperatures within 2 K ͑see Table I͒. Unknowns, such as layer separation, interstitial pressure, and material specifics, make modeling difficult.…”

Section: Thermal Modelmentioning

confidence: 99%

Demonstration of low temperature radiative cooler for future space missions

Cushman

Mather

Fixsen

1997

Review of Scientific Instruments

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A probability analysis of space radiator segmenting for increased reliability and reduced mass AIP Conf.Low temperature radiative coolers permit more sensitive, lower temperature detectors for science instruments in space, and can extend the length of missions at low cost and mass. A miniature radiative cooler was designed, constructed, and tested and achieved a stabilized temperature of 34 K with no load and an outer shell temperature of 91 K. This is an improvement upon previous lower limits of radiative coolers of 50 K. Thermal modeling and experiment agree within 2 K.

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Insulation Progress since the Mid-1950s

Timmerhaus

Cryogenic Engineering

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Experimental Studies of MLI Systems at Very Low Boundary Temperatures

Cited by 24 publications

References 1 publication

Improving MRI magnet thermal performance using variable density multilayer insulation

Improving MRI magnet thermal performance using variable density multilayer insulation

Demonstration of low temperature radiative cooler for future space missions

Insulation Progress since the Mid-1950s

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